HHH-19088: Add a test that demonstrates the NPE in Envers when using StatelessSession.insert()

[mrts]

Reproduces the NullPointerException in Envers that occurs during StatelessSession.insert() of an entity that has the Envers @Audited annotation.

This test throws a NullPointerException with the message "Cannot invoke \"org.hibernate.engine.spi.SessionImplementor.isTransactionInProgress()\" because \"session\" is null".

As the Hibernate metamodel generator generates Jakarta Data Repository implementations with stateless sessions, Envers is not currently compatible with Jakarta Data Repositories because of this error.

See

• bug report: https://hibernate.atlassian.net/browse/HHH-19088
• corresponding discussion: https://discourse.hibernate.org/t/hibernate-envers-6-jakarta-data/10955/7.

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